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Annotation of researchv10no/cmd/basic/bite/src/pathopen.c, revision 1.1

1.1     ! root        1: /* Copyright Bell Telephone Laboratories Whippany, N.J.
        !             2: 
        !             3:  *     /////////////////////////////////////
        !             4:  *     /////////////////////////////////////
        !             5:  *     //// SEARCH PATHS AND OPEN FILE /////
        !             6:  *     /// J. P. Hawkins WH X4610 8C-001 ///
        !             7:  *     ///// Wed Sep 12 11:18:06 1979 //////
        !             8:  *     /////////////////////////////////////
        !             9:  *     /////////////////////////////////////
        !            10: 
        !            11:  * call format:
        !            12:  * FILE *pathopen(),*fp;
        !            13:  *     fp = pathopen(filestring);
        !            14:  *
        !            15:  * Search paths specified in bpath for file. If found,
        !            16:  * open the filename pointed to by filestring and return filepointer fp.
        !            17:  * If search fails return 0.
        !            18:  * Same convention as fopen().
        !            19:  */
        !            20: /*   "@(#) pathopen.c:  V 1.2  3/14/81" */
        !            21: #include "bas.h"
        !            22: char bpath[100] = ":./:/usr/lib/bites:";
        !            23: 
        !            24: FILE *
        !            25: pathopen(name)
        !            26: char   name[];
        !            27: {
        !            28:        FILE *fopen(),*fp;
        !            29:        char    *getpath();
        !            30:        char filpath[80];
        !            31:        register char *p;
        !            32:        p = bpath;      /* start with first entry in paths */
        !            33: 
        !            34:        while((p = getpath(filpath,p)) != 0)
        !            35:        {
        !            36:                strcat(filpath,"/");
        !            37:                strcat(filpath,name);
        !            38:                if((fp = fopen(filpath,"r")) != 0) /* if open succeeds */
        !            39:                        break;
        !            40:        }
        !            41:        if(fp == 0)     /* if open did not succeed */
        !            42:        {
        !            43:                error(inst.thing.linno,4);
        !            44:                return(0);
        !            45:        }
        !            46:        return(fp);
        !            47: }
        !            48: 
        !            49: /*
        !            50:  * SCAN PATH STRING
        !            51:  */
        !            52: char *
        !            53: getpath(field,s)
        !            54: char   *s;
        !            55: char   field[];
        !            56: {
        !            57:        int     i;
        !            58:        char    *p;
        !            59: 
        !            60:        i = 0;
        !            61:        p = s;
        !            62:        if(*p == ':') *p++;     /* bump past delim */
        !            63:        while(*p != '\0' && *p != ':')
        !            64:        {
        !            65:                field[i++] = *p++;
        !            66:        }
        !            67:        field[i] = '\0'; /* null terminate */
        !            68: 
        !            69:        if(p != s)
        !            70:                return(p);
        !            71: 
        !            72:        return(0);
        !            73: }

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